What is the standard -850 mV criterion for cathodic protection of buried steel as specified in NACE SP0169, and what reference electrode is it measured against?
Cp Criteria
Question · Easy
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What four elements form a corrosion cell?
Fundamentals of Corrosion
Flashcard
A CP tester measures a pipe-to-soil potential of -900 mV vs CSE with the rectifier ON. After instant-off, the potential reads -780 mV vs CSE. Which of the following statements is MOST accurate?
Field Measurement
Question · Medium
Electrode where oxidation and metal loss occur in a corrosion cell, while the other electrode stays protected.
Electrochemical basics
Guess the Term
Chapter 1: Introduction & CP Exam Overview
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Study guide
Cheat sheet
Which of the following is the PRIMARY purpose of the instant-off (interrupt) technique when measuring pipe-to-soil potential?
Read the clue and guess the term in 6 tries.
Game
Where does oxidation occur in a corrosion cell?
A CP tester reads a pipe-to-soil potential of -0.780 V using a silver/silver chloride (Ag/AgCl, saturated KCl) reference electrode. Approximately what is the equivalent potential in mV vs CSE?
Reference Electrodes
Question · Hard
Basic unit through which nearly all corrosion proceeds, made of two electrodes, connecting paths and a driving voltage.
What is the MOST common electrolyte used in a portable copper/copper sulfate reference electrode?
Where does reduction occur in a corrosion cell?
Which reference electrode is MOST appropriate for cathodic protection measurements on an offshore platform submerged in seawater?
General name for a charged particle, positive or negative, that carries current through an electrolyte.
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The 100 mV polarization decay criterion in NACE SP0169 is used to demonstrate adequate cathodic protection. How is it measured?
Swap tiles to line up three of the same term.
Term Match
What is an electrolyte?
Which of the following is the PRIMARY safety hazard when interrupting a rectifier feeding a pipeline with coating faults near a high-voltage AC transmission line?
Safety
Kind of current that flows on a structure outside its intended circuit, arriving from sources such as electrified rail lines.
Influencing factors
What is the primary function of a shunt in a CP test station or rectifier?
Equipment
What does cathodic protection do to a structure?
Ohm's Law states the relationship between which three quantities?
Electrical Fundamentals
Galvanic anode metal with a practical potential of about -1.10 V against a saturated copper sulfate reference.
CP components
Corrosion Science & Industry Terminology Glossary
A pipeline rectifier reads 24 V DC output and 10 A DC output with a circuit resistance of 2.4 ohms. Is this consistent?
Flip two cards at a time to find matching terms.
Term Pairs
How does a galvanic CP system supply current?
Which of the following BEST describes an impressed current cathodic protection (ICCP) system?
Cp Systems
Organism-driven metal attack that fungi, bacteria and algae speed up, a special risk for assets in sewage, fuels, seawater or soil.
Which galvanic anode is MOST commonly used for cathodic protection of buried steel pipelines in higher-resistivity soils?
How does impressed-current CP supply current?
Which of the following is a common method used to measure soil resistivity in the field?
SI base unit of electric current, defined since 2019 by the elementary charge.
Electrical fundamentals
Field Mathematics & Ohm's Law Fundamentals
In the Wenner four-pin soil resistivity test, pins are spaced 10 feet apart and the measured resistance is 2.0 ohms. What is the soil resistivity?
Find five hidden terms in a grid of letters.
Term Search
What is polarization in cathodic protection?
Which soil resistivity range is typically considered MOST corrosive to buried steel?
Corrosion Fundamentals
Calibrated resistor of known, fixed value placed in a circuit so the current through it can be calculated from the voltage across it.
Equipment management
What does a structure-to-electrolyte potential measurement of -0.500 V vs CSE on a bare steel pipeline indicate?
What is depolarization?
Which portion of a CP circuit does Faraday's Law relate current flow to mass loss?
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